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One of the most-anticipated performances of Friday night’s iHeartRadio Music Festival was Katy Perry — and she didn’t let us down! The “Roar” singer treated fans to a medley of some of her biggest hits, including “California Gurls,” “Firework,” “Part of Me,” and “Teenage Dream,” as well as the first single off her Prism album and another new track, “Dark Horse” with Juicy J. -

She performed some of her many #1 hits: I Kissed A Girl, Dark Horse, Part Of Me, Wide Awake, California Gurls, Teenage Dream, Firework, Roar Source

they tweeted that they're gonna be there today and they'll ' have a little something to share too' so i'm guessing that means they're performing 'rage' or at least i'm hoping so...i love that my bitches are back!

Basic Queen Katy really needs to re-evaluate the style of this era. the vma's was stunning idk what she's serving with this milkmaid, selenas bustier disaster. the dark horse performance was more awkward than the song itself and she killed my fave song part of me with that embarrassing breakdown, she was so into it too you can tell with her face. ugh katy get it together. i mean wtf is this

one more thing i love this pic she's like swerve with drake leaning in